//  Copyright 2011 Charlie Garrett
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//
//  Register.cpp
//

#include <sstream>

#include "Register.h"

namespace logic {
    using namespace std;
    
    // Registers of different kinds are aliases of each other.  So only the number
    // distinguishes different registers.
    bool Register::operator<(const Register &other) const {
        return number < other.number;
    }
    
    string Register::ToString() {
        ostringstream os;
        switch (kind) {
            case UNALLOCATED:
                return string("UNALLOCATED");
            case TEMPORARY:
                os << "X" << number;
                return os.str();
            case PERMANENT:
                os << "Y" << number;
                return os.str();
            case ARGUMENT:
                os << "A" << number;
                return os.str();
        }
    }
    
    Register Register::Unallocated(UNALLOCATED, 0);
}  // namespace logic
